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| кислородный | |||
| 氧气的: 37 phrases in 8 subjects |
| Aviation | 1 |
| Ecology | 1 |
| Environment | 3 |
| General | 10 |
| Oil / petroleum | 1 |
| Research and development | 3 |
| Technology | 16 |
| Water supply | 2 |
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